Ensure archive hashcheck in older Salt and fix residual issues with maven.env state

[noelmcloughlin]

(1) Ensure archive hash is checked in olders salt.

     Fix: Workaround for https://github.com/saltstack/salt/pull/41914 

(2) Consistent formatting in settings.sls file

     Fix: Update formatting/layout.

(3) Some residual issues with maven.env state:

• Few variables in pillar.example have wrong values relating to alternatives.

  • Change some requires to onchanges for cleaner dependency-failure experience.

    Fix: I updated pillar.example and env.sls to address these residual issues.

tested on OpenSuse Leap / SALT 2013.3 with/without pillars.

[noelmcloughlin]

@sroegner You seem to be committer, please review with comments. Do not approve/merge btw.

[noelmcloughlin]

This conflicts with master - closing.